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He fell in love with a human woman and they had a hanyō daughter together, Shiori. His father considered him weak for doing so. Father and son would later have an argument about this, with Tsukuyomaru having decided to leave his demon clan for the human village where his wife and daughter lived. He would also abandon the hereditary duty of creating a barrier with the red orb.[1] His father's hatred then came to a head and he killed Tsukuyomaru without any remorse, planning to use Shiori instead to care for the red orb.[2]

Great Demonic Power: As the former guardian of the Demon Bat Barrier and heir to the Demon Bat Clan, Tsukuyomaru is a powerful demon. Though despite him being a Daiyōkai, his father was able to easily kill him which implies that his powers aren't that advanced yet during their confrontation. However Tsukuyomaru is obviously well valued amongst the clan as his father was desperate in obtaining Shiori as the new guardian after killing his son. Lastly he had enough power to bypass the Blood Coral Crystal's soul collection in order to protect his wife and daughter.

Flight: Being a bat demon, Tsukuyomaru had wings that are used for flight though unlike the other members of the clan, his wings are folded over his back like a cape.

Blood coral crystal (former): As Tsukuyomaru was the previous guardian of the barrier before his daughter, he once held the blood coral crystal which is an heirloom of the clan.

Impenetrable Barrier: The barrier created by the Demon Bat Clan is said to be impenetrable. However only the guardian of the barrier is able to create this all powerful barrier through the use of the blood coral crystal. The ability wanes with age and eventually once it's passed on to next through heredity, the power is lost altogether. The crystal itself can create a personal barrier around itself if it's ever threatened.

Demonic Aura: The crystal can emit a large amount of demonic aura that puts half-demons and possibly weaker demons into a trance and burns a human if they touch it should the crystal's existence be threatened.

Soul Collection: The crystal can collect the souls of all the other previous guardians of the barrier within the clan that stores up the demonic powers whenever it's passed on to the next. This collection of souls can also be released from the crystal to defend it should it ever be threatened. Though despite this, some souls like Tsukuyomaru can forcefully escape from it.

Armor: Tsukuyomaru was shown to be wearing parts of a samurai armor over his brown kimono during the flashbacks depicting him.

Sword: Tsukuyomaru was depicted having a sword equipped on his person when he met Shizu and during his confrontation with his father.